They will smooch, take to dinner, do whatever it takes to bribe the head of office staff. Then once they're in the door they convince you to hire 5-10 of their 'Epic Engineers' and charge you $500+ an hour for the honor.
Soon you discover that you can never really get rid of those engineers and need to hire your own on staff team... Which you probably could have done with literally any other EMR if you wanted to customize it.
2 years in the medical staff hate life and the front of house staff have costed their business 50-100M in fees.
Alberta found this out the hard way after spending 5 years and 450M+ on Epic. Roughly $100 per person in the province was required to get Epic 'running'. (I am not sure if its been rolled out to all of Alberta?)